16780947 has 4 divisors (see below), whose sum is σ = 22374600. Its totient is φ = 11187296.

The previous prime is 16780919. The next prime is 16780963. The reversal of 16780947 is 74908761.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74908761 = 3 ⋅24969587.

It is a cyclic number.

It is not a de Polignac number, because 16780947 - 2¹⁴ = 16764563 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16780899 and 16780908.

It is not an unprimeable number, because it can be changed into a prime (16780987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2796822 + ... + 2796827.

It is an arithmetic number, because the mean of its divisors is an integer number (5593650).

Almost surely, 2^16780947 is an apocalyptic number.

16780947 is a deficient number, since it is larger than the sum of its proper divisors (5593653).

16780947 is an equidigital number, since it uses as much as digits as its factorization.

16780947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5593652.

The product of its (nonzero) digits is 84672, while the sum is 42.

The square root of 16780947 is about 4096.4554190178. The cubic root of 16780947 is about 256.0189754408.

The spelling of 16780947 in words is "sixteen million, seven hundred eighty thousand, nine hundred forty-seven".